The Giants did nothing to alleviate the fears of their fans and loyalists who look at this team and see a glaring deficiency on the offensive line. Rather than ease those concerns, the performance of that unit in a 19-3 loss Sunday night to the Cowboys opened the floodgates and sounded alarms.

“At the end of the day there’s not much to hang your hat on, scoring three points and getting beat like we got beat,’’ left guard Justin Pugh said.

The Giants brought back their five-man offensive line intact from 2016, with general manager Jerry Reese banking on improvement, especially from 23-year old tackles Ereck Flowers and Bobby Hart. This was not a heartening start.

The Giants could not have embarked on the season worse, as far as the play of their offensive line. They went three-and-out on the first series, with Eli Manning sacked by DeMarcus Lawrence, who ran a stunt and eased past right guard John Jerry.

The second time the Giants had the ball, it was more of the same. Manning was pressured on consecutive plays and on third down Lawrence blew past Hart and Jerry was called for a holding penalty, which was declined as Manning was forced into a throwaway.

In the third quarter, Charles Tapper notched the first sack of his NFL career, dropping Manning for a 9-yard loss after bull-rushing his way through Flowers.

“We just didn’t do what we can do, didn’t do what we are capable of,’’ center Weston Richburg said. “That produced the result.’’

The Cowboys do not have an overly talented defensive line and rely on movement up front to cause disruption. That movement was expected by the Giants, but they could not handle it.

“We’re struggling to block it,’’ coach Ben McAdoo said.

Asked how to improve on that, McAdoo said, “Get better with your technique.’’

Lawrence ended up with two sacks, but Hart said, “He was just rushing it, wasn’t anything crazy. They do a lot of things with their scheme that helps their players out.’’